Door-bell



(Model) 2 Sheets--Sheet 1.

0. w. BULLARD. DOOR BELL;

No.-347,226. PatenfedAug. 10,1886.

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2 Sheets sheet 2.

(Model) 0. -w. BULLARD. v

11003 BELL.

Pat'nted Aug. 10, 1886.

FIG. 6'.

UNITED STATES,

PATENT OFFICE.

CHARLES WV. BULLARD, OF CHICAGO, ILLINOIS.

DOOR-BELL.

SPECIFICATION forming part of Letters Patent No. 347,226, dated August 10, 1886.

Application filed April 25, 1885. Serial No. 163,465. iModcl.)

To aZZ whom it may concern.-

Be itknown that I, CHARLES W. BULLARD, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Mechanical Door Bells and Alarms; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to that ciassof door bells or alarms in which is employed a train of alarm mechanism that is released to ring an alarm-bell when the door pull or push, as the case may be, is manipulated from the outside; and the objects of my improvement are, first, to provide, in connection with a mechanical door-bell that is rung by a train of gearing,'a stop mechanism operated by a pushbutton (or other similar device capable of operation by hand) at the outside of the door,

so that by the depression of the push-button the alarm mechanism will be released to give an alarm, and which, after the push-button is released, such stop mechanism will engage and stop the alarm mechanism after a predetermined number of strokes have been given to the bell; second, to afford means whereby the stop-wheel of the alarm mechanism and its stop pawl or catch are adapted to be released by either a push, pull, or bellcrank lever at the outside of the door, or bya cord extending to asuitable burglar-alarm device that is operated by the unauthorized opening of a door or window. I attain such objects by the construction and arrangement of parts illustrated in the accompanying drawings, in whichv Figure l is a front elevation, with parts broken away, of the alarm mechanism, the rim of the bell being shown in section; Fig. 2, an

end elevation of the same with the alarm-bell in section; Fig. 3, a sectional elevation at line,

vice for the stop or escapement wheel and catch of the train of alarm mechanism a bellcrank lever or pull having its fulcrum in a plate at the outside of the door; Fig. 5, a similar view illustrating as an operating device to release the stop or escapement wheel and catch a push-button at the outside of the door. Fig. 6 is a detail perspective view of the parts illustrated in Fig. 3, and Fig. 7 an enlarged detail section through the post to which the bell is secured, illustrating the position and arrangement of the winding-spindle of the alarm mechanism.

Similar letters of reference indicate like parts in the several views.

Referring to the drawings, A represents the main or base plate by which the frame 13 of the alarm mechanism is secured to the back of the door or any other desired position. The frame B is of the usual form employed for clock-work, being provided with bearings for the main driving-shaft O that carries the driving-spring D, driving spur-wheel E, and wind ing ratchet e and click 0; also, for the shaft that carries the pinionf and ratchet-wheel F, that operates the clapper-carrying lever G, the shaft of which is also pivoted in the frame B. This lever G has at one end the clapper or strike h of the alarm-bell H, and the other end the pallet-piece 9, that engages with and is operated by the ratchetwheel F of the alarm mechanism. \Vhen circumstances require, it is evident that'intermediate gear may be introduced between the main driving spurwheel E and the pinion f, so asto increase the capacity of the mechanism.

' The bell II is secured in place by being screwed upon or otherwise secured to a hollow post or sleeve, h, upon the frame B, through which passes the main driving-shaft O, which has its projecting end formed to re ceive the winding-key of the alarm mechanengagement with oneof the arms by means of a spring, a. The other end of the arm I is arranged in line with the spindle j ofa pushbutton, J, arranged at the outside of the door, as indicated in Fig. 5, so that when said button is depressed it will move the lever I to release the arm z with which it is engaged, and

allow the alarm mechanism to operate the bell-clapper until the next adjacent arm i reaches the catch-point i" of the lever I, when any further movement of the alarm mecharn ism will be stopped, the lever I having been seasonahly released from the pressure of the push-button or other operating device. It will be seen by reference to the drawings that the stop-wheel I is placed on the end of the main driving-shaft that carries the operatingspring D, while the ratcheted elap )er-o )erating wheel F is arranged on a counter-shaft, re-

Vceiving an accelerated movement from the main driving-shaft through spur-wheel E and pinion f, in consequence of which the movement of said main shaft will be comparatively slow, due to the work performed by the clapper-operating wheel F. The purpose of this arrangement is to provide ample time to the party operating the push-button to release the same during the turning of the stop-wheel the distance between the arm of said wheel next following the one released, such interval of time being occupied by the clapper-operating wheel in giving the necessary alarm. The lever 1 is also formed with an inclined face, 5", under which moves an offset or lug 7:, upon a sliding piece, K, and which is held out of engagement with said lover I by a spring, k, as indicated in Figs. 3, t, and 5. The piece or plate K is also provided with an offset or lug. k, that is adapted to be engaged and operated by the inner end of the bell-crank pull L, as indicated in Fig. 4.

The piece or plate K is secured in place and "guided by screws is. that pass through elongated slots is in said plate and screw into the base-plate A of the alarm mechanism.

K is a hole or stud in or on the plate K, at

the end opposite to that at which the spring k is attached. This hole or stud is intended for the attachment of a cord or chain, that may extend to a pull at a distance or to a burglaralarm device attached to a door or window of the building.

I am aware that prior to my invention mechanical burglaralarms have been provided with a train of alarm-gear to operate the clapper of an alarm-bell, and that such train of gearing has been provided with a stop-wheel, which would be released from engagement with a suitable stop to give an alarm through a releasing device (having suitable connections with said stop) that would be operated by the opening of the door or window after the apparatus had been set to give an alarm.

I therefore do not claim such combination, broadly; but

What I do claim as my invention, and desire to secure by Letters Patent, is-

1. In a mechanical door-bell, the combination of an alarm-bell and a train of operatinggearing provided with a stop-wheel, I, with the catch or stop-lever I 4." t, and sliding plate K k, adapted to be operated either by a bell-crank lever or a pull-cord, substantially as and for the purpose set forth.

2. In a mechanical door-bell, the combination of an alarm-bell and a train of operatinggearing provided with a stop-wheel, I, with the catch or stop lever I, having catclrpoint i, inclined face if, and spring 6-, and the plate K, having spring is and lugs k k", essentially as and for the purpose described.

CHARLES W. BULLARD.

XVitnesses:

Ronnn'r Bonus, JAs. H. (ionnmzv, 

